Question re: med tx vs. stent?

My father has just undergone a angiogram and was advised that his Right Coronary artery is 100% blocked. 8 years ago he had his first angiogram d/t tightening in the throat symptoms upon exersion. His angiogram at that time showed a very small occlusion in the lower aspect of the heart- resulting in the stable angina.
The lastest angiogram also revealed "new arteries" had formed and have compensated for the blockage somewhat. My question is : with 100% blockage and reduced blood flow as stated in the report from the angiogram should a stent not be looked at? My father's  ECG and Inhanced stress test were both negative. The blockage was only seen from the angiogram. What is the likelyhood in resolving this blockage with a stent therefore reducing or eliminating the angina symptoms?
My concern is, by not looking after this blockage and potentially waiting for another to develop elsewhere vs. just continuing to take medication to keep the angina "at bay"?

[ed34]

Your father is lucky enough to have the genes that cause new adaptation vessels to grow, not everybody has this ability. I assume a nuclear scan has been done to ensure
all the heart tissue on the right side is alive and kicking?
I have had your thoughts pondering through my head for years now and it still eludes me
why some cardiologists don't balance risk with quality of life properly. It seems that many would rather leave you suffering symptoms and drugged up suffering the side effects such as feeling lethargic than actually doing something more long term to resolve
the problem. There are angioplasty techniques that can remove the total blockage and
it seems difficult to find a specialist who can do this. I went through all experts in three heart hospitals and all of them seemed too afraid. There are lasers and drills and all kinds of tools to remove a blockage to greatly improve someones quality of life. If the heart tissue is all healthy then I think exactly as you do, why not do something.
One thing your father needs to do though is try to slow the disease right down. He needs
to learn to 'chill' and get on a strict diet. Every six months have his cholesterol lipids checked. I would pressure the cardiologists to consider giving a long term solution. Even if it means going to different hospitals until you find one with the confidence.
I always believe that if technology exists to improve the quality of someones life, why not
use it. That's why it was developed with tax payers money.